There are over 50 UK species in the apiaceae (carrot) family, also known as umbelliferae, characterised by alternate leaves, often finely divided, sheathing bases to the leaf stalks, and umbrella-like flower clusters, often compound. Indivudual flowers are small, with five lobes, five stamens and two stigmas. Many species have bracts at the base of the inflorescence, and/or bracteloles below the secondary pedicels.